EFEN is a next generation energy analysis tool using EnergyPlus simulation engine and intelligent building generator. It is packaged in a user friendly program suitable for quick analysis in early stages of design, comparative energy analysis of different fenestration options and prediction of the whole building energy use, and prediction of the size of HVAC equipment. EFEN is also very useful in early stages of design when decisions are made about the placement and type of fenestration products, building orientation, overall building shape, prediction of the whole building energy use and prediction of the size of HVAC equipment. More info can be found here: https://www.fenestration.com/efen.php